The Achaians, under King Agamemnon, have been fighting the Trojans off and on for nine years, trying to retrieve Helen, the wife of Menelaos, and thus Agamemnon's sister-in-law. Paris, a son of the king of Troy, kidnaps Helen, who becomes the legendary "Helen of Troy" and "the woman with the face that launched a thousand ships."
Yet, after years of Achaian attacks, Troy remains intact, and the Trojan army remains undefeated. The same cannot be said for the Achaian army. At present, the Achaian troops are dying from a mysterious plague. Hundreds of funeral pyres burn nightly. Finally, Achilles, the Achaians' most honored soldier, calls for an assembly to determine the cause of the plague.
A soothsayer reveals to the army that King Agamemnon's arrogance caused the deadly plague; he refused to return a woman who was captured and awarded to him as a "war prize." Reluctantly, Agamemnon agrees to return the woman, but, as compensation, he says that he will take the woman who was awarded to Achilles, his best warrior.
Achilles is furious, and he refuses to fight any longer for the Achaians. He and his forces retreat to the beach beside their ships, and Achilles asks his mother, the goddess Thetis, if she will ask Zeus, king of the gods, to help the Trojans defeat his former comrades, the Achaians. Zeus agrees to do so.
